<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="js/jquery-1.8.1.min.js"></script>
    <script>
        $(function () {

            //
            $("input").toggle(
                function () {
                    $("body").css("background-color", "red");
                },
                function () {
                    $("body").css("background-color", "green");
                },
                function () {
                    $("body").css("background-color", "yellow");
                }
            );


            $(".box").hover(
                function () {
                    $(this).css("background-color", "blue");
                },
                function () {
                    $(this).css("background-color", "green");
                }
            );
        })
    </script>
</head>

<body>
    <input type="button" value="按钮">

    <div class="box" style="width: 100px; height: 100px; background-color: pink;">555</div>

</body>

</html>